drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * based on exynos_drm_drv.c
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_fb_helper.h>
  19 #include <drm/drm_gem_cma_helper.h>
  20 #include <drm/drm_of.h>
  21 #include <drm/drm_probe_helper.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/dma-iommu.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/module.h>
  26 #include <linux/of_graph.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/component.h>
  29 #include <linux/console.h>
  30 #include <linux/iommu.h>
  31
  32 #include "rockchip_drm_drv.h"
  33 #include "rockchip_drm_fb.h"
  34 #include "rockchip_drm_fbdev.h"
  35 #include "rockchip_drm_gem.h"
  36
  37 #define DRIVER_NAME     "rockchip"
  38 #define DRIVER_DESC     "RockChip Soc DRM"
  39 #define DRIVER_DATE     "20140818"
  40 #define DRIVER_MAJOR    1
  41 #define DRIVER_MINOR    0
  42
  43 static bool is_support_iommu = true;
  44 static struct drm_driver rockchip_drm_driver;
  45
  46 /*
  47  * Attach a (component) device to the shared drm dma mapping from master drm
  48  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  49  * mapping.
  50  */
  51 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  52                                    struct device *dev)
  53 {
  54         struct rockchip_drm_private *private = drm_dev->dev_private;
  55         int ret;
  56
  57         if (!is_support_iommu)
  58                 return 0;
  59
  60         ret = iommu_attach_device(private->domain, dev);
  61         if (ret) {
  62                 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
  63                 return ret;
  64         }
  65
  66         return 0;
  67 }
  68
  69 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  70                                     struct device *dev)
  71 {
  72         struct rockchip_drm_private *private = drm_dev->dev_private;
  73         struct iommu_domain *domain = private->domain;
  74
  75         if (!is_support_iommu)
  76                 return;
  77
  78         iommu_detach_device(domain, dev);
  79 }
  80
  81 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
  82 {
  83         struct rockchip_drm_private *private = drm_dev->dev_private;
  84         struct iommu_domain_geometry *geometry;
  85         u64 start, end;
  86
  87         if (!is_support_iommu)
  88                 return 0;
  89
  90         private->domain = iommu_domain_alloc(&platform_bus_type);
  91         if (!private->domain)
  92                 return -ENOMEM;
  93
  94         geometry = &private->domain->geometry;
  95         start = geometry->aperture_start;
  96         end = geometry->aperture_end;
  97
  98         DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
  99                   start, end);
 100         drm_mm_init(&private->mm, start, end - start + 1);
 101         mutex_init(&private->mm_lock);
 102
 103         return 0;
 104 }
 105
 106 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
 107 {
 108         struct rockchip_drm_private *private = drm_dev->dev_private;
 109
 110         if (!is_support_iommu)
 111                 return;
 112
 113         drm_mm_takedown(&private->mm);
 114         iommu_domain_free(private->domain);
 115 }
 116
 117 static int rockchip_drm_bind(struct device *dev)
 118 {
 119         struct drm_device *drm_dev;
 120         struct rockchip_drm_private *private;
 121         int ret;
 122
 123         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 124         if (IS_ERR(drm_dev))
 125                 return PTR_ERR(drm_dev);
 126
 127         dev_set_drvdata(dev, drm_dev);
 128
 129         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 130         if (!private) {
 131                 ret = -ENOMEM;
 132                 goto err_free;
 133         }
 134
 135         drm_dev->dev_private = private;
 136
 137         INIT_LIST_HEAD(&private->psr_list);
 138         mutex_init(&private->psr_list_lock);
 139
 140         ret = rockchip_drm_init_iommu(drm_dev);
 141         if (ret)
 142                 goto err_free;
 143
 144         drm_mode_config_init(drm_dev);
 145
 146         rockchip_drm_mode_config_init(drm_dev);
 147
 148         /* Try to bind all sub drivers. */
 149         ret = component_bind_all(dev, drm_dev);
 150         if (ret)
 151                 goto err_mode_config_cleanup;
 152
 153         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 154         if (ret)
 155                 goto err_unbind_all;
 156
 157         drm_mode_config_reset(drm_dev);
 158
 159         /*
 160          * enable drm irq mode.
 161          * - with irq_enabled = true, we can use the vblank feature.
 162          */
 163         drm_dev->irq_enabled = true;
 164
 165         ret = rockchip_drm_fbdev_init(drm_dev);
 166         if (ret)
 167                 goto err_unbind_all;
 168
 169         /* init kms poll for handling hpd */
 170         drm_kms_helper_poll_init(drm_dev);
 171
 172         ret = drm_dev_register(drm_dev, 0);
 173         if (ret)
 174                 goto err_kms_helper_poll_fini;
 175
 176         return 0;
 177 err_kms_helper_poll_fini:
 178         drm_kms_helper_poll_fini(drm_dev);
 179         rockchip_drm_fbdev_fini(drm_dev);
 180 err_unbind_all:
 181         component_unbind_all(dev, drm_dev);
 182 err_mode_config_cleanup:
 183         drm_mode_config_cleanup(drm_dev);
 184         rockchip_iommu_cleanup(drm_dev);
 185 err_free:
 186         drm_dev->dev_private = NULL;
 187         dev_set_drvdata(dev, NULL);
 188         drm_dev_put(drm_dev);
 189         return ret;
 190 }
 191
 192 static void rockchip_drm_unbind(struct device *dev)
 193 {
 194         struct drm_device *drm_dev = dev_get_drvdata(dev);
 195
 196         drm_dev_unregister(drm_dev);
 197
 198         rockchip_drm_fbdev_fini(drm_dev);
 199         drm_kms_helper_poll_fini(drm_dev);
 200
 201         drm_atomic_helper_shutdown(drm_dev);
 202         component_unbind_all(dev, drm_dev);
 203         drm_mode_config_cleanup(drm_dev);
 204         rockchip_iommu_cleanup(drm_dev);
 205
 206         drm_dev->dev_private = NULL;
 207         dev_set_drvdata(dev, NULL);
 208         drm_dev_put(drm_dev);
 209 }
 210
 211 static const struct file_operations rockchip_drm_driver_fops = {
 212         .owner = THIS_MODULE,
 213         .open = drm_open,
 214         .mmap = rockchip_gem_mmap,
 215         .poll = drm_poll,
 216         .read = drm_read,
 217         .unlocked_ioctl = drm_ioctl,
 218         .compat_ioctl = drm_compat_ioctl,
 219         .release = drm_release,
 220 };
 221
 222 static struct drm_driver rockchip_drm_driver = {
 223         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 224                                   DRIVER_PRIME | DRIVER_ATOMIC,
 225         .lastclose              = drm_fb_helper_lastclose,
 226         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 227         .gem_free_object_unlocked = rockchip_gem_free_object,
 228         .dumb_create            = rockchip_gem_dumb_create,
 229         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 230         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 231         .gem_prime_import       = drm_gem_prime_import,
 232         .gem_prime_export       = drm_gem_prime_export,
 233         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 234         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 235         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 236         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 237         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 238         .fops                   = &rockchip_drm_driver_fops,
 239         .name   = DRIVER_NAME,
 240         .desc   = DRIVER_DESC,
 241         .date   = DRIVER_DATE,
 242         .major  = DRIVER_MAJOR,
 243         .minor  = DRIVER_MINOR,
 244 };
 245
 246 #ifdef CONFIG_PM_SLEEP
 247 static int rockchip_drm_sys_suspend(struct device *dev)
 248 {
 249         struct drm_device *drm = dev_get_drvdata(dev);
 250
 251         return drm_mode_config_helper_suspend(drm);
 252 }
 253
 254 static int rockchip_drm_sys_resume(struct device *dev)
 255 {
 256         struct drm_device *drm = dev_get_drvdata(dev);
 257
 258         return drm_mode_config_helper_resume(drm);
 259 }
 260 #endif
 261
 262 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 263         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 264                                 rockchip_drm_sys_resume)
 265 };
 266
 267 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 268 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 269 static int num_rockchip_sub_drivers;
 270
 271 /*
 272  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 273  * Should be called from the component bind stage of the drivers
 274  * to ensure that all subdrivers are probed.
 275  *
 276  * @ep: endpoint of a rockchip vop
 277  *
 278  * returns true if subdriver, false if external bridge and -ENODEV
 279  * if remote port does not contain a device.
 280  */
 281 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 282 {
 283         struct device_node *node = of_graph_get_remote_port_parent(ep);
 284         struct platform_device *pdev;
 285         struct device_driver *drv;
 286         int i;
 287
 288         if (!node)
 289                 return -ENODEV;
 290
 291         /* status disabled will prevent creation of platform-devices */
 292         pdev = of_find_device_by_node(node);
 293         of_node_put(node);
 294         if (!pdev)
 295                 return -ENODEV;
 296
 297         /*
 298          * All rockchip subdrivers have probed at this point, so
 299          * any device not having a driver now is an external bridge.
 300          */
 301         drv = pdev->dev.driver;
 302         if (!drv) {
 303                 platform_device_put(pdev);
 304                 return false;
 305         }
 306
 307         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 308                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 309                         platform_device_put(pdev);
 310                         return true;
 311                 }
 312         }
 313
 314         platform_device_put(pdev);
 315         return false;
 316 }
 317
 318 static int compare_dev(struct device *dev, void *data)
 319 {
 320         return dev == (struct device *)data;
 321 }
 322
 323 static void rockchip_drm_match_remove(struct device *dev)
 324 {
 325         struct device_link *link;
 326
 327         list_for_each_entry(link, &dev->links.consumers, s_node)
 328                 device_link_del(link);
 329 }
 330
 331 static struct component_match *rockchip_drm_match_add(struct device *dev)
 332 {
 333         struct component_match *match = NULL;
 334         int i;
 335
 336         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 337                 struct platform_driver *drv = rockchip_sub_drivers[i];
 338                 struct device *p = NULL, *d;
 339
 340                 do {
 341                         d = bus_find_device(&platform_bus_type, p, &drv->driver,
 342                                             (void *)platform_bus_type.match);
 343                         put_device(p);
 344                         p = d;
 345
 346                         if (!d)
 347                                 break;
 348
 349                         device_link_add(dev, d, DL_FLAG_STATELESS);
 350                         component_match_add(dev, &match, compare_dev, d);
 351                 } while (true);
 352         }
 353
 354         if (IS_ERR(match))
 355                 rockchip_drm_match_remove(dev);
 356
 357         return match ?: ERR_PTR(-ENODEV);
 358 }
 359
 360 static const struct component_master_ops rockchip_drm_ops = {
 361         .bind = rockchip_drm_bind,
 362         .unbind = rockchip_drm_unbind,
 363 };
 364
 365 static int rockchip_drm_platform_of_probe(struct device *dev)
 366 {
 367         struct device_node *np = dev->of_node;
 368         struct device_node *port;
 369         bool found = false;
 370         int i;
 371
 372         if (!np)
 373                 return -ENODEV;
 374
 375         for (i = 0;; i++) {
 376                 struct device_node *iommu;
 377
 378                 port = of_parse_phandle(np, "ports", i);
 379                 if (!port)
 380                         break;
 381
 382                 if (!of_device_is_available(port->parent)) {
 383                         of_node_put(port);
 384                         continue;
 385                 }
 386
 387                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 388                 if (!iommu || !of_device_is_available(iommu->parent)) {
 389                         DRM_DEV_DEBUG(dev,
 390                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 391                                       port->parent);
 392                         /*
 393                          * if there is a crtc not support iommu, force set all
 394                          * crtc use non-iommu buffer.
 395                          */
 396                         is_support_iommu = false;
 397                 }
 398
 399                 found = true;
 400
 401                 of_node_put(iommu);
 402                 of_node_put(port);
 403         }
 404
 405         if (i == 0) {
 406                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 407                 return -ENODEV;
 408         }
 409
 410         if (!found) {
 411                 DRM_DEV_ERROR(dev,
 412                               "No available vop found for display-subsystem.\n");
 413                 return -ENODEV;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 420 {
 421         struct device *dev = &pdev->dev;
 422         struct component_match *match = NULL;
 423         int ret;
 424
 425         ret = rockchip_drm_platform_of_probe(dev);
 426         if (ret)
 427                 return ret;
 428
 429         match = rockchip_drm_match_add(dev);
 430         if (IS_ERR(match))
 431                 return PTR_ERR(match);
 432
 433         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 434         if (ret < 0) {
 435                 rockchip_drm_match_remove(dev);
 436                 return ret;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 443 {
 444         component_master_del(&pdev->dev, &rockchip_drm_ops);
 445
 446         rockchip_drm_match_remove(&pdev->dev);
 447
 448         return 0;
 449 }
 450
 451 static const struct of_device_id rockchip_drm_dt_ids[] = {
 452         { .compatible = "rockchip,display-subsystem", },
 453         { /* sentinel */ },
 454 };
 455 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 456
 457 static struct platform_driver rockchip_drm_platform_driver = {
 458         .probe = rockchip_drm_platform_probe,
 459         .remove = rockchip_drm_platform_remove,
 460         .driver = {
 461                 .name = "rockchip-drm",
 462                 .of_match_table = rockchip_drm_dt_ids,
 463                 .pm = &rockchip_drm_pm_ops,
 464         },
 465 };
 466
 467 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 468         if (IS_ENABLED(cond) && \
 469             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 470                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 471 }
 472
 473 static int __init rockchip_drm_init(void)
 474 {
 475         int ret;
 476
 477         num_rockchip_sub_drivers = 0;
 478         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 479         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 480                                 CONFIG_ROCKCHIP_LVDS);
 481         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 482                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 483         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 484         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 485                                 CONFIG_ROCKCHIP_DW_HDMI);
 486         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 487                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 488         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 489
 490         ret = platform_register_drivers(rockchip_sub_drivers,
 491                                         num_rockchip_sub_drivers);
 492         if (ret)
 493                 return ret;
 494
 495         ret = platform_driver_register(&rockchip_drm_platform_driver);
 496         if (ret)
 497                 goto err_unreg_drivers;
 498
 499         return 0;
 500
 501 err_unreg_drivers:
 502         platform_unregister_drivers(rockchip_sub_drivers,
 503                                     num_rockchip_sub_drivers);
 504         return ret;
 505 }
 506
 507 static void __exit rockchip_drm_fini(void)
 508 {
 509         platform_driver_unregister(&rockchip_drm_platform_driver);
 510
 511         platform_unregister_drivers(rockchip_sub_drivers,
 512                                     num_rockchip_sub_drivers);
 513 }
 514
 515 module_init(rockchip_drm_init);
 516 module_exit(rockchip_drm_fini);
 517
 518 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 519 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 520 MODULE_LICENSE("GPL v2");